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What is the exact location of rash?
Itching,peeling of skin,redness,swelling,pain?
Since how long has she been suffering from?
Is rash spreading?
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Hello. Do you have any pictures of the rash prior to putting on the purplish substance?
Well, it's quite difficult to make out what is going on below the purple dye, but based on your description, I would like you to consider, and discuss with her doctors, the possibility that she might have a condition known as Bullous pemphigoid. This bubbling rash occurs when the immune system attacks a thin layer of tissue below the outer layer of skin, causing bullae (fluid-filled bubbles) to form. The reason for this abnormal immune response is unknown, although it sometimes can be triggered by taking certain medications. Prescription drugs that may cause bullous pemphigoid include penicillin, etanercept (Enbrel), sulfasalazine (Azulfidine) and furosemide (Lasix). Ultraviolet light therapy to treat certain skin conditions may trigger bullous pemphigoid as well, as can radiation therapy to treat cancer. To confirm the diagnosis, a small sample of the affected skin can be biopsied and sent to the lab for evaluation. This would be a good idea to get a definitive diagnosis, so you can get your mom on the right treatment (and feeling better) right away.
I see. Well, I wanted to throw that out as it is considered an urgent condition and requires prompt treatment. Otherwise, you would have to consider other bullous or vesicular rashes such as shingles (which typically lasts only a few weeks but can get secondarily infected), Norwegian scabies (crusted scabies), allergic dermatitis with secondary impetigo, etc. These types of rashes require specialized treatmtent. If she hasn't seen a dermatologist recently, this would be a good idea as conventional treatments are not likely to help. If a clear diagnosis is not forthcoming, a biopsy should be done so that it can be looked at under the microscope. You might also consider seeing a rheumatologist, as this could be an autoimmune condition requiring a course of prednisone or other immune-modulatory therapy.