I'm sorry to hear about the patches and blisters on your lip. White or pink patches following blisters could be due to several causes, including healing from a viral infection like herpes simplex, a reaction to medication, or a pigment-related condition such as vitiligo.

Since you mentioned blisters earlier and now have color changes, it might be related to skin healing or a pigment disorder. For example, some treatments for pigment disorders, like the medication Melanocyl (which contains methoxsalen), can cause skin redness, swelling, or blisters as side effects, and sometimes changes in skin color.

It is important to have a thorough evaluation by a dermatologist, who can examine the patches, possibly perform tests, and determine the exact cause. They can also advise on appropriate treatment and whether any medication you are taking might be contributing to these symptoms.

Recommendation: Please consult a dermatologist promptly to get an accurate diagnosis and appropriate care. If you experience worsening symptoms, pain, or spreading of the patches, seek medical attention sooner.