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Doctor insights on: Dark Blisters

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Dr. Philip Miller
1,673 doctors shared insights

Blistering (Definition)

Blistering is a bubble of skin filled with fluid. They can occur to excessive rubbing (as with a new pair of ...Read more


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I have a big dark red blister in the mouth. What it is?

I have a big dark red blister in the mouth. What it is?

Depends on cause: Aphthous stomatitis involving the common canker sore can occur in up to 15% of americans, and may involve some bacteria like staph epidermidis. However, similar-appearing aphthous ulcers can be seen with herpes, crohn's disease, and other systemic disorders, if you have multiple aphthous ulcers or frequently recurring ones please have the lesions checked out. ...Read more

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Dark, red blister like patch/spot on my bottom lip. never had cold sore before so what could this be?

Dark, red blister like patch/spot on my bottom lip. never had cold sore before so what could this be?

Uncertain: Cold sores are painful liquid filled blisters that can occur on the lips, roof of the mouth or the gums which are usually caused by the herpes simplex virus (HSV-1). Tingling &/or pain can herald the oncoming of cold sore 1 to 2 days prior to eruption. ...Read more

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Small dark purple blister/canker sore inside of bottom lip. What is it??

Small dark purple blister/canker sore inside of bottom lip. What is it??

Hard to say: could be something simple as a minor injury or small viral outbreak such as canker sore or aphthous ulcer but you need to get in with your dentist to make a proper determination. ...Read more

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What to do if dark coloured lump/blister on inner cheek?

What to do if dark coloured lump/blister on inner cheek?

See your derm: or ENT. If it doesn't go away in 1-2 weeks I would biopsy ...Read more

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I had back surgery 6 months ago, but I still have dark streaks and blisters on my back. Is this normal?

I had back surgery 6 months ago, but I still have dark streaks and blisters on my back. Is this normal?

?blisters: How extensive of a surgery did you have? Did you have adhesive tape covering for an extended period of time? Have you had the chicken pox or shingles? Have you reported this to your surgeon? You should. ...Read more

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A dark big red blister surrounded by red skin on my baby's feet!! What can it be?

A dark big red blister surrounded by red skin on my baby's feet!!
What can it be?

Multiple or single?: Red blisters on baby's feet is never normal, and without a photo, it is hard to diagnose. Blisters can be caused by repeated friction, infection, burns and cold injury. Multiple small blisters on feet and hands can be caused by a viral infection such as enterovirus. I recommend that you get urgent evaluation. ...Read more

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I noticed two small dark red blood blisters in my right inner cheeks..I nevr had them before and i don't remember biting my cheeks either. I'm worried.?

Likely local trauma: It is most likely local trauma from the teeth but should be examined by a doctor to ensure nothing else is going on. There are viral illnesses and other local infections/masses that can present this way and a good exam will hopefully exclude anything serious. ...Read more

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