helloo doctor i have black colour on my neck and...

To treat black discoloration on the neck and upper and lower chest  , follow these tips:
Stay away from foods that contain fatty substances such as liqueurs and chocolate
Use Hydroquinon cream but prevents exposure to sunlight with it
Avoid preparations containing ammonia
Use coconut oil mask and sesame oil
Use sulfur soap or antiseptic soap
In the case of the effects of acne, you can use the creams of vitamin A derivatives or in the form of pills such as isoterentoin but has an effect on pregnancy and liver so must be discontinued before planning for pregnancy by 6 months and must be performed liver function analysis every month to two months
Use a moisturizing cream such as pepanthene because the use of vitamin A derivatives causes severe dryness of the skin
Laser skin peeling can be done by shedding specific light waves on the skin to exfoliate layer after layer by evaporation of damaged cells and removing stains and effects.
What causes black discoloration on the neck and upper and lower chest  , follow these tips:?
Increased pigmentation
acne traces
Clogged in the ducts of sweat and sebaceous glands
Use of special chemicals containing ammonia