Why Is My Leopard Gecko Turning Yellow: Possible Causes and Solutions

By Mandy Thompson

January 9, 2025


Understanding Leopard Gecko Coloration

Genetics and Morph Variations

Leopard geckos come in a variety of color morphs, each with its unique coloration and pattern. The genetic makeup of a gecko determines its coloration, and breeders have selectively bred different morphs over the years. Some popular morphs include tangelo, carrot tails, and dark bands, each with its distinct features.

Age-Related Changes

As leopard geckos age, their coloration may change, and they may turn yellow or tan. This change in color is a natural part of the aging process and can be attributed to a decrease in melanin production. However, bright yellow or orange morphs may maintain their vibrant coloration even as they age.

In conclusion, understanding leopard gecko coloration involves an understanding of genetics and morph variations, as well as age-related changes. While some morphs may be more prone to turning yellow or tan as they age, others may maintain their bright coloration. By knowing what to expect, gecko owners can better care for their pets and appreciate their unique beauty.

Health and Nutrition Factors

Calcium and Vitamin D3

One of the main reasons why leopard geckos turn yellow is due to calcium and vitamin D3 deficiencies. These two nutrients are essential for the proper development of bones and muscles. Leopard geckos require a high amount of calcium and vitamin D3 to prevent metabolic bone disease, which can lead to deformities and even death.

Calcium powder is an excellent source of calcium and should be dusted on the leopard gecko’s food at least once a week. Vitamin D3 is obtained through exposure to UVB lighting. Leopard geckos should have access to UVB lighting for at least 10-12 hours per day.

Diet and Nutritional Deficiencies

Leopard geckos require a balanced diet that includes a variety of insects such as crickets, mealworms, and waxworms. Feeding schedule should be consistent, and the amount of food should be appropriate for the gecko’s size. Nutritional deficiencies can occur when a gecko is not receiving the proper nutrients from their diet.

To prevent nutritional deficiencies, leopard geckos should be fed a variety of insects and supplemented with vitamins. It is important to avoid feeding them insects that are too large or that have hard exoskeletons, as they can cause impaction in the digestive system.

In conclusion, providing a balanced diet and proper nutrition is essential in preventing leopard geckos from turning yellow. Calcium and vitamin D3 deficiencies can lead to serious health problems, and nutritional deficiencies can cause a variety of issues. By following a proper feeding schedule and providing the necessary supplements, leopard gecko owners can ensure that their pets remain healthy and vibrant.

Environmental Influences

Leopard geckos are highly adaptable creatures that can change their skin color to blend with their surroundings. However, changes in their environment can also cause them to turn yellow. Here are some environmental factors that could affect the color of your leopard gecko.

Temperature and Lighting

Leopard geckos require a specific temperature range to thrive. If the tank temperature is too high or too low, it can cause stress and lead to changes in skin color. UV light is also essential for leopard geckos, and a lack of it can cause them to turn yellow.

Habitat and Substrate

The type of substrate used in the tank can also affect the color of your leopard gecko. Loose sand or sand mix can cause impaction, which can lead to stress and changes in skin color. Pebbles, flat stones, and slate are better options for substrate. Coco fibers can also be used, but they should be kept moist to prevent respiratory problems.

In conclusion, environmental factors such as temperature, lighting, and substrate can all influence the color of your leopard gecko. It’s important to ensure that the tank environment is conducive to their needs to keep them healthy and happy.

Behavioral and Stress Responses

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Shedding Process

Leopard geckos shed their skin as they grow, and this process is normal. During shedding, their skin may appear yellow or dull, and this is due to the shedding process. It is important to provide your leopard gecko with a moist hide box, which will help them shed their skin more easily. If the shedding process is not going well, then it may be a sign that your leopard gecko is not getting enough moisture.

Stress Indicators

Stress can also cause your leopard gecko to turn yellow. If your leopard gecko is stressed, they may hide more often and not come out to eat or drink. It is important to provide them with hiding spots and places to feel safe. When handling your leopard gecko, make sure to do so gently and not to startle them. If your leopard gecko is stressed, it may also be a sign of an underlying health issue, so it is important to monitor their behavior closely.

In summary, turning yellow in leopard geckos can be a result of the shedding process or stress. Providing your leopard gecko with a moist hide box and hiding spots can help them shed their skin more easily and reduce stress levels. If you notice any unusual behavior or signs of stress, it is important to monitor your leopard gecko closely and seek veterinary care if necessary.

Potential Health Issues

Leopard geckos are generally healthy creatures, but they can still experience health issues that can cause them to turn yellow. These issues can range from skin and color disorders to infections and parasites. It’s important to keep an eye on your pet’s health and behavior to identify any potential problems early on.

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Skin and Color Disorders

Leopard geckos can change colors for a variety of reasons, including stress, temperature changes, and shedding. However, if your gecko is turning yellow and showing unusual skin patterns, it could be a sign of a more serious issue. Melanin is responsible for the coloration of a gecko’s skin, and any disruption in its production can lead to changes in color. If your gecko’s skin is turning yellow, it could be due to an unhealthy diet or an issue with their immune system.

Infections and Parasites

Infections and parasites can also cause a leopard gecko to turn yellow. Bacterial infections, such as mouth rot, can cause discoloration and other symptoms, including loose stool and lethargy. Internal parasites can also cause a variety of health issues, including changes in skin color. If you suspect your gecko has an infection or parasite, it’s important to seek medical attention from a qualified vet.

Overall, it’s important to monitor your leopard gecko’s health and behavior to identify any potential issues early on. By keeping an eye out for changes in skin color, patterns, and behavior, you can help ensure your pet stays healthy and happy.

Feeding and Supplementation

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Proper Insect Diet

One of the reasons why a leopard gecko may turn yellow is due to an improper insect diet. Leopard geckos are insectivores and require a diet rich in protein. Some common insects that can be fed to leopard geckos include crickets, mealworms, and dubia roaches. It is important to gut-load the insects before feeding them to the gecko to ensure that they are receiving the proper nutrients.

Supplementing with Calcium and Vitamins

Leopard geckos also require calcium and vitamins to maintain healthy bones and overall health. Calcium powder should be dusted onto the insects before feeding them to the gecko. Vitamin supplements can also be added to the gecko’s diet to ensure that they are receiving all the necessary nutrients.

It is important to note that dietary changes should be made gradually to avoid stressing the gecko. If a leopard gecko is turning yellow, it may be a sign that their diet needs to be adjusted. Consulting with a veterinarian or a reptile expert can help determine the best course of action.

Identifying Normal vs. Concerning Changes

Leopard geckos are known for their unique and beautiful patterns, with shades of brown, green, and yellow. While some color and pattern changes are normal for leopard geckos, others may indicate underlying health issues.

Normal color changes in leopard geckos include bright yellow or dull yellowing, which can be a sign of shedding or normal aging. However, if the yellowing is accompanied by other symptoms such as lethargy or loss of appetite, it may be a sign of a more serious health issue.

On the other hand, concerning changes in leopard geckos include a sudden change in color, such as turning from brown to yellow or green. This may indicate a stress response or an underlying health issue. It is important to monitor any changes in your leopard gecko’s color and behavior and seek veterinary care if necessary.

In summary, while some color changes are normal for leopard geckos, it is important to be aware of any sudden or concerning changes in color or behavior. By monitoring your leopard gecko’s health and seeking veterinary care when necessary, you can help ensure a long and healthy life for your beloved pet.

When to Consult a Veterinarian

While some changes in a leopard gecko’s coloration may be normal, sudden or drastic changes in color can be a sign of underlying health issues. If a leopard gecko is turning yellow and showing other signs of illness such as lack of appetite, lethargy, or difficulty breathing, it is important to consult a veterinarian as soon as possible.

A veterinarian can perform a physical exam and run diagnostic tests to determine the underlying cause of the color change. It is important to seek medical attention promptly as some conditions, such as liver disease, can be life-threatening if left untreated.

In addition to seeking medical attention for health concerns, it is also important to consult a veterinarian if a leopard gecko is exhibiting unusual behavior or has stopped eating. These can be signs of stress or other underlying health issues that require medical attention.

If a leopard gecko is a breeding female, it is especially important to seek veterinary care if she is turning yellow. This can be a sign of egg binding, a condition where a female is unable to pass eggs, which can be life-threatening if left untreated.

While some breeders may have experience in treating leopard geckos, it is important to seek medical attention from a qualified veterinarian for any health concerns. A veterinarian can provide the necessary medical care and advice to help ensure the health and well-being of a leopard gecko.

Frequently Asked Questions

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What causes a leopard gecko to change its coloration?

Leopard geckos can change their coloration due to various reasons, including stress, temperature, diet, and genetics. For example, a stressed gecko may turn pale or develop dark spots, while a gecko with a poor diet may have a duller coloration. Additionally, some leopard geckos may naturally change their coloration as they age.

Is it normal for leopard geckos to become more yellow with age?

Yes, it is common for leopard geckos to become more yellow as they age. This is due to the accumulation of carotenoids, which are pigments that give the skin a yellow or orange color. However, if the yellowing is sudden and accompanied by other symptoms, it may indicate a health issue.

How can I distinguish between natural color variation and potential health issues in my leopard gecko?

It can be challenging to distinguish between natural color variation and potential health issues in leopard geckos. However, if the color change is sudden, accompanied by other symptoms such as lethargy or loss of appetite, it may indicate a health issue. It is essential to monitor your gecko’s behavior and appearance regularly to detect any changes.

What does it indicate if my leopard gecko is developing brown or grey spots?

Brown or grey spots on a leopard gecko may indicate a skin infection or injury. It is essential to monitor the spots’ size, shape, and color and seek veterinary care if they appear to be spreading or causing discomfort to the gecko.

How frequently do leopard geckos shed and can this affect their color?

Leopard geckos shed their skin every 4-6 weeks, and this can affect their coloration. Before shedding, a gecko’s skin may appear dull or opaque, and after shedding, the skin may appear brighter and more vibrant. However, if the color change persists after shedding, it may indicate a health issue.

What are the signs of infection in leopard geckos, and how does it affect their appearance?

Signs of infection in leopard geckos include lethargy, loss of appetite, swelling, and discharge. Infections can affect the gecko’s appearance, causing changes in coloration, such as dark spots or discoloration. It is crucial to seek veterinary care if you suspect your gecko has an infection.

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