Slow hair growth is due to reasons such as lack of vitamins, demanding work, or hereditary influences. If you notice that your hair is no longer growing as fast as it used to, you should try eating a balanced diet full of vitamins and minerals, for example, vitamin D and iron. Besides, find some time for yourself to practice relaxation techniques to de-stress. 

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. 

It can cause burns and pain by touching the skin. Cold water makes it cold. Then take Ibuprofen or other painkiller plus cover it tightly with a bandage after wrapping it with moist and cool dressing.