Do I have balanitis with redness and inflammation?

You might be suffering from a fungal skin infection known as ringworm. Ringworm can turn your skin into white, reddish, thick, dry, and scaly. Apart from that, the skin can get very itchy. Ringworm is a type of fungus that spreads through skin-to-skin contact. To help get rid of ringworm, you can use antifungal cream. However, it would be best if you cleaned and dried the area.

Dandruff is a COMMON scalp condition causing itching and flaking. Hair loss can be caused by GENETICS, stress, or illness. Maintaining good scalp hygiene can help reduce dandruff. Use a medicated shampoo containing SALICYLIC ACID or KETOCONAZOLE to treat dandruff. Consider seeing a dermatologist if symptoms persist. Eat a balanced diet rich in PROTEIN and VITAMINS for healthy hair..

The likelihood of HIV infection is negligible if a diabetic needle pricks your hand. HIV is transferred via blood, however, the needle prick is not a high-risk exposure. If you are concerned, watch out for symptoms such as flu, fever, or rash. If you see them, go to a doctor. 

Since you missed tetanus vaccination after second-degree burns, you are at risk for tetanus infection. The symptoms may be visible within 3 to 21 days, usually at 7 to 10 days. Tightness of muscles, spasms in the jaw, and difficulty in swallowing are some of the symptoms that one may experience. If you notice these signs, you should seek medical attention at once. The tetanus vaccine can, however, be administered after an injury to avoid infection. 

Hair loss can be caused by a various factors such as genetics, hormonal changes, stress, medications etc. But there are treatments such as topical medications like minoxidil, hair transplants, etc.  that exist to manage hair loss issues. I recommend you to visit a qualified hair transplant doctor. Based on the severity of your hair loss and other factors, he may suggest the best solution for you.