Scalp still inflamed from using a shampoo weeks ago it just gets worse everyday. also the skin on my neck is red and patchy please help my skin is red?

Oil: Try coconut oil and use different shampoo without alcohol.

Skin rash: It sounds allergic in nature from using the shampoo, although, can't be sure without seeing it. A picture would help way better.

Dermatitis: Sounds like you originally developed a contact dermatitis from the irritant shampoo. First step in treatment was to stop and avoid the shampoo, which you did i suppose. Then treatment would involve medication to decrease the inflammatory reaction like steroids possibly. A dermatologist would be best to examine you, and determine what rx would be best to treat the issue, good luck.

See a dermatologist: Since you have not used the shampoo for weeks, you need to look for a different diagnosis such as seborrheic dermatitis or psoriasis. The correct diagnosis will result in the best remedy.