Is itching on scalp in one area only a symptom of skin cancer? can skin cancer develop underneath the hair and not just hairline? also is damaged skin with rash more vulnerable to uv light?

Need to examine: Skin cancer can develop anywhere, but it is less likely in an area covered by hair. If you have any doubt, see your doctor. Have a healthy diet, exercise 30 minutes/day, drink plenty of water, have safe sex, no tobacco alcohol weed or street drugs. For nutrition: http://www.choosemyplate.gov/. Get HPV vaccine. Wish you good health!