Why is my split toenail yellow after 1 year?

Tanning is produced by the skin when it absorbs more sunlight. This is the process that involves melanin, a protein that protects the skin. To decrease tanning and melanin, try a kojic acid soap. This soap can decrease the melanin in your skin and thus brighten your skin's color. For best results, use it daily.

The marks are the result of the body's response to the mosquito's saliva. They may gradually diminish by themselves over time, however, you can also apply over-the-counter creams with ingredients such as hydroquinone or vitamin E that will help in the process. Remember, use sunscreen and cover your skin to avoid more bites.

Dealing with acne­ spots and dark spots on your face for two years is frustrating. Consider using aze­laic acid: safe for most people. A 10% conce­ntration is effective. It re­duces acne breakouts and fade­s discoloration. Use it daily by applying a thin layer after cle­ansing. Complement with sunscree­n and moisturizer. 

Psoriasis is a common disease that causes red, painful, and rough patches on the skin. It happens when the immune system goes out of control and skin cells grow too fast. A dermatologist can prescribe therapy to relieve the skin. After treatment, using creams or lotions helps reduce dryness and itching. Keeping the skin clean and well-moisturized can also help reduce discomfort.

It appears that you are experiencing symptoms of oral thrush, a condition that causes your tongue to be covered in white. Smoking is one of the major causes of this disease, and so is drinking alcohol or having a weak immune system. The most effective way to deal with it is to reduce smoking and alcohol intake, as well as maintain good oral hygiene. Additionally, drinking more water can also help.

Your testis might have some white spots, which probably are Fordyce spots. The latter is a harmless issue and common. They are small, raised, and painless. Oil glands that secrete too much oil end up clogging pores, and thus, we see these dots on the skin. Emotional tension or fluctuations in the levels of hormones could cause them. Usually, Fordyce spots do not require any treatment. 

The contact dermatitis can last a long time. It depends upon the nature, frequency and duration of the exposure to the allergens. If the exposure to the allergens continues it might take very long time. If the exposure to the allergens is stopped then it will be recovered quickly.