Pitting of the nails, resembling a number of small dents, could be due to a skin condition known as psoriasis. Distorted nails can also be due to fungal infection, hardening of the arteries and vitamin deficiency.
I would suggest you to get it evaluated from a dermatologist. KOH examination and culture of the nail scrapings can be done to confirm the diagnosis. It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your dermatologist. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
pitting of fingernails is common with eczema, they can have ridges in them too. the pubic itching could be eczema, but i would get it checked out as it could be many other things too, not related to sexual activity etc.