Skin, Hair and Nail Problems

My daughter is 3.5 years old and having a patch of black blue colour under her neck. Please tell me is what is this?

I have significantly darker knees and elbows. How should I lighten them and what are the products I should be using ?

Yesterday while bathing i felt a bump on the base of my penis.i dont know if it was there before or if its a new one.it is itchy.its darker in colour and round.

I am a nursing student in the very next month we are going to have our hospital postings but I m facing the problem of excessive sweating on my hands and palms at the same time I also face an allergy from an unknown reason but I am facing it since childhood and it appears in every summers . The allergy causes small bubbles on my palms and feets and after some time it forms dark red patches on it . If I take medications it gets cured but the sweating doesn't get cured . Please tell me some medicine to stop this problem of hyperhydrosis so that I can excel in my career.

I have been experiencing extreme hair fall and brittle hair for quite some time now. My B12 levels are around 224 pg/dL, they fall within the normal range but are they low ? is B12 the reason for my bad hair health ?

I had warts under my left eye. Three years ago I underwent surgery to remove the wart which was successfully removed but some portion was left. Now I want to remove that portion also as it is on my face. Pls suggest which is the best way to remove laser treatment or cryotherapy. I am also attaching an image of my current wart. I am currently in kanpur

What should I do to control my hair loss and receding hairline. Also the area where my hair has gone secret a lot of oil which I can see while whipping the area with a tissue.

Can we use Perlice permethrin cream 1% for 4 yr old kid...does it has any side effect on hair of kids

Having this dark patch on 1 of cheek from last 3 years , don't know how this appeared. Earlier it was not there

I have multiple mole in my private area for the past 2 yrs.. the number looks increasing and size too.. no pain or colour change. It appears on the place where skin compression takes place.. in armpits also is there.