It appears that you may have a certain disorder of the Sebaceous (oil) Glands. See the websites listed below for further information:
Sebaceous glands (oil glands) are all over the body except on the palms of hands and soles of feet. The glands empty via ducts into the bases of hair follicles and secrete sebum (a mixture of fats, waxes, and hydrocarbons). Sebum keeps hair moist and prevents skin from drying. Sebaceous glands are numerous on the face and scalp. ...............
Skin (Integumentary) System Information
Disorders of the Sebaceous (Oil) Glands
Dealing with Skin Problems
Also, please note that Painful sores, blisters, or bumps that develop on the scalp may be caused by:
Scalp Problems -- Topic Overview
I trust that your doctor is a dermatologist....if not, your regular physician should refer you to one. Certainly, a prescription may be necessary to treat - or proper hair solution, as well as proper diet, drink plenty of water. Don't be afraid to ask your doctor questions - he/she is there to assist you...and to heal.
Should you have any further questions, please do not hesitate to contact me.
Please take care.
Peace, Love & Happiness,
The Mystic Wave