On a simplistic level, medication should be taken for the prescribed duration and not less, irregardless of the fading of symptoms - many STIs are asymptomatic or have latent phases in their progression anyway. Lots of medication is given to reduce the effects of incurable STIs like HPV ,HBV or HIV (Viral). However antibiotics are given to bacterial infections like syphilis or chlamydia which can remove the pathogen, thusly the presenting symptoms. "Medication" is a broad term ,as is "STI", so unfortunately there isn't a neat, all-encompassing answer as there are too many variables . Play it safe and say, "No" as incorrectly taken medication is harmful not only for the patient but the wider population as it increases the risk of pathogen resistance.
Cancers, such as melanomas, squamous cell and Basal cell carcinomas, are extremely common cancer. These cancers can often happen due to mutations of skin cells due to constant exposure to sun and other energy.
Acne's Vulgaris and Rosacea; are two relatively common age related disorders that that are marked by frequent redness, itchiness, swelling, abscess, and zit formation.
Athlete's Foot or tinea pedis is a fungal infection of the skin (mostly happens at the feet) that causes dry and scaly rash, with pruritis (or itching).
Cellulitis; different to Dermatitis in that Cellulitis involves the rapid degeneration of skin and the tissues bellow, by bacteria. Mostly these infections are caused by Streptococcus and staphylococcus.
Strawberries, a rich source of vitamin C, benefit your hair.