It seems that the burn is rather extensive and does not heal well. I would suggest early consultation with a dermatologist or burn specialist. Do not use any more cream and let the wound dry. It is essential to keep the wound well cleaned, dressed and treated. Seek medical help at the earliest.

You could get relieved by itching, red spots, and peeling sometimes. Switching your soap might help, but as neem doesn't work for you, let's find some alternative. Seek for soaps endowed with the elements such as tea tree or coconut oil. There is a chance that these can aid in the combat against the fungus without the risk of your skin looking dehydrated. To add, be cautious enough to rinse thoroughly and pat the skin dry after the application of the soap.

Worry does not leave marks on your skin. Howe­ver, it may cause restle­ssness. Restless pe­ople sometimes scratch or bump into obje­cts. This can result in bruises forming. Fee­ling tense weake­ns your body's defenses. A we­akened immune syste­m makes bruising more likely. To pre­vent stress-relate­d bruising, you should find ways to relax. Try calming activities, exe­rcising regularly, and eating nutritious foods.

Hair loss can be due to several factors such as stress, unhealthy diet, or hormone variations. It's normal for humans to shed up to 100 strands of hair daily. But if it's a lot more than usual, you might notice bald spots or thinner hair. Eating well, calming your mind, and using hair products that are not too harsh may help to prevent hair loss. 

The numerous factors that lead to skin allergies on the backside and legs include irritants, allergenic agents, infection or autoimmune disorders. It is necessary to consult a dermatologist that will conduct sufficiently comprehensive evaluation and suggest adequate options for treatment. Self-diagnosis and self treatment can make the situation only worse complicating it.