Skin, Hair and Nail Problems

I am 24M 65kg weight under no medication. Recently I have noticed this dark patch on ny skin under my armpit area in the attachment I have uploaded the pic not sure what it is. Needed to know what exactly is this?

I have small dots on four fingers of my right hand, including the nail and surrounding area. My hand already has some allergy. On my little finger, there is a short black vertical line that grows back even after trimming. There was no injury. I have attached a photo for reference. I am concerned and would like it checked.

I had so much tiny acne on my face now they are gone but they gave dark spots and it looks like I got burned from anything that looks very embarrassing to me...anyone please suggest me any medicine

I had these from a very young age 14 15 maybe but it got worse from 17 i got so many marks n stuff i went to diff medications nothings workwd i used then tret and damicin a many cleared marks also cleared but i used mameartg serum my skin wrnt back and more worse i have lots of pie pih n active acne but no scars after that my doc said use meladel i used it i used foxtale rapid drops i left i used tret again then left i used minimalist traneamic acid n deconstruct akin clearing serum now i m using aziderm 15 gel with deconstruct skin clearing serum and deconstruct oil free moisturiser pls suggest if it is a right routine? Also i have itching on my skin a lot today

My lips remains very dry, with cracks and it is not curing. It also become black colour. Please help with any solution

During my childhood I faced second degree burns, I have scars of burns on my thighs and stomach . What could be done to remove them, how much improvement is possible

About 9days ago, my toenail got partially detached from the root on the right side. The left side of the nail is still attached, so the skin underneath isn’t visible. The pain has now reduced a lot, and even when I press it slightly, it doesn’t hurt. There’s no pus visible. But there are some scabs visible near the edges and a whitish-yellowish patch is visible beneath the nail. I've been using Betadine only and changing the bandage. I just want to know how long I should continue dressing it and what the next step in the healing process will be. I haven't taken any medicine so far.

I am 7 month postpartum and breastfeeding mother . I was recommended by dermatologist acne oc moisturizer for acne . Since it has retinol ingredients in it Wanted to confirm its safety

Hi , I got a single boil on my jaw line and after 3-4 days now it seems to be spreading fast and gone to three in count. Pls suggest medicine for the same.

Im having sebaceous hyperplasia on my forehead. I need a tropical treatment to remove or lighten that