At the age of 46, body hair loss might occur due to alopecia universalis, an auto-immune condition that results in hair fall. It can be managed with immunosuppression. said that a proper diagnosis is mandatory before starting treatment and a proper dermatology consultation is important

If you are having recurrent acne this is probably due to the hormonal fluctuation which results into increased oily skin on the face, the scalp, chest and there are few things that has to be taken care. One thing not to apply hair oil, avoid having dandruff or use anti-dandruff shampoos weekly on the scalp, using face washes that have salicylic acid or glycolic acid. Avoid using thick greasy moisturizers or cream on the face. Use only creams that are gel based or water based. Drink plenty of water, avoid fat or cheesy diet, exercise 10-15 mins of the day. Topical steroids have to be avoided. Topical antibiotics like Clindamycin are useful. Oral Antibiotics or retinoids are advised. Even some patients require peeling sessions. A proper consultation with dermatologist is more helpful. 

If the rash is occurring on cheek in 3-4 months old child is most probably due to atopic dermatitis which is dry irritated skin condition resulting in itching and oozy skin. This might also effect other body parts like face, neck, front of elbows, back of knees and child might become irritated. It has to be managed with syndate bars or soaps, proper moisturizers, avoiding the irritants and oral or topical steroids. Proper consultation with dermatologist is advisable.

Pyderma gangrenosum is an autoimmune reaction that is characterized by painful bleeding non ailing ulcers most probably over the extremities and like any other autoimmune condition this requires the suppression of autoimmunity with immuno-suppressants either with topical agents or oral medications. as it is a chronic condition it requires a long term management. Contacting dermatologist is advisable.

If you are loosing hair at 24 years, that is most probably due to pattern hair loss or androgenetic alopecia which requires topical and oral medications. If medications are used within time, this will result in stopping the further hair loss and reversal of the hair loss as well. Said that proper diagnosis is mandatory before moving any further and a proper dermatology consultation is required for diagnosis and proper management