### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
Hello Sir, I am a 32 year old female. My arms and back are extremly pigmented. I can assume that the pigmentation on my arms is because of sun exposure but i have never exposed my back to sun but still it is deeply pigmented and it also has a big dark patch in the middle. I consulted a dermatologist for my arms and she gave me Hyclean cream. I want to know that for how long i have to apply this cream and is there any other treatment available for my problem.

### output:

Hi, Welcome and thanks for posting your query to Chat Doctor. It appears from your query that your pigmentation can be either due to simple tanning part or the other important cause is known as "lichen amyloidosis". If it is due to simple tanning then your cream - Clean would be beneficial to improve the pigmentation. It contains sunscreen and skin bleaching agents so giving you dual benefit. It is to be applied thinly, preferably at nighttime but can be applied at daytime also. One pea size amount over the fingertip is sufficient for palm size of skin. Do not rub it over the affected area or direct exposure to sun, otherwise can cause irritation. If it is lichen amyloidosis then all the treatments actually are less effective. You take guidance from your dermatologist regarding exact cause of the pigmentation. She would guide you for the same. It has to be applied at least for 2-3 months to see visible results. There are many a treatment available but before that we need to clarify the exact cause. Along with it eat a lot of vitamin C and vitamin A containing fruits and present sun exposure. Hope these information will help. With good health wishes" Chat Doctor. 