Skin, Hair and Nail Problems

Is hormonal imbalance cause grey hair.or what are the reason for causing greying hair.how to stop it

My sister started having rashes on her entire body from past few days. We thought that it was because of any insect-bite. We did pest-control spray in our home. But even then, the rashes are increasing on her body. These are itchy and give her sleepless nights. I read few articles which said that skin rashes have also been found in few COVID patients. We are really scared now as my father also started having same symptoms from past two days. What should we do now? Please advise.

I am having these black patches from last 1 month, there was itching when they started but now there is no itching. But I think they are spreading because when it started it was a small patch. Please suggest me some medicine or something to get rid of these. I have attached pictures of these patches.

I have a problem of skin allergy (hives) , now I am taking levocetrizine , my question is can I take levocetrizine after covid vaccination .

In my scrotal 4-5 nodules are formed. Is this problem can be treated by medication? Is this a bacterial infection?

I was asked to do 24 hr urine calcium test for which I was given a bottle with some chemical in it. Since, funnel was not there, I tried urinating in it directly and I think a drop of that chemical got touched to glans causing burning sensation. The chemical smells like dettol. I immediately washed it with soap. And now the burning sensation has reduced a lot. It is negligible now. Should I go for treatment? Can I ignore this?

Hey, i want to which health checkup will help me with hair loss problem.. My hair density is reduced to half in 1-2year

I have a hair fall problem, should i change my shampoo , what should we do for hair fall problem plz tell me , about my diet, i don't take junk nd oily but as well i aslo don't take a dairy products

Sir, I got pale red patch on left side of neck few months ago, now I see similar patches on right side of the neck area. Would like to understand if this is any serious issue indication.

I have pigmentation on forehead and sides .. have had that for years now... how do I get rid of it.. ?