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.

Acne is common, causing pimples and oily skin. Hair follicles ge­t blocked with oil and dead skin cells. You can try soap with salicylic acid or be­nzoyl peroxide. These­ ingredients unplug pores and re­duce acne. Gently wash your face­, avoid harsh scrubbing.

It's a common issue when sweat and oils get trapped in our skin pores. Prolonged sitting can make it even worse. The best over-the-counter treatment is to use a mild cleanser with salicylic acid to shrink the pores. To that end, also, take breaks from sitting and keep the area clean and dry. Stay hydrated and wear loose, breathable clothing. 

Leukoplakia is a disorder where white patches occur on the skin. The spots can develop in the mouth or on the neck. Symptoms may consist of rough patches that do not go away. Causes can be smoking, irritation, or infection. Treatment consists of medicines such as Tab. diflazacort, Creativity ointment, Pentop dsr, and Lycopene with multivitamin tablets as prescribed by your doctor. 

It seems you are facing a heat rash which is a common condition. Your skin gets too hot due to the sun and it can make your skin red, itchy, and throbbing. After a time, you should avoid wearing clothes that are too tight. Make sure to wear cool, loose-fitting clothes. Moreover, always keep below clean and dry when there is a chance of heat rash. Calamine lotion can also be a good option to use to relieve the burning skin. Drinking enough water is important.