recurring sore on lip that scars

[memet]

Hello,
Every so often I will get a sore on my bottom lip (always in the same place, in the center) that starts as a  kind of rough, raw patch and breaks out into small blisters (but not fluid-filled), then heals into a dark, unsightly scar.  The scar usually takes a week or two to go away.

Any ideas?

[memet]

Thanks!  I'll look into it.

[Dr_Aparna]

Hi,
This could be an allergic reaction.Contact dermatitis is an inflammation of the skin caused by direct contact with an irritating or allergy-causing substance (irritant or allergen). Reactions may vary in the same individual over time. A history of any type of allergies increases the risk for this condition.
It is caused by exposure to a material to which the person has become hypersensitive or allergic. The skin inflammation varies from mild irritation and redness to open sores, depending on the type of irritant, the body part affected, and the sensitivity of the individual.
It presents as skin lesion or rash at the site of exposure which maybe  papules (pimple-like), vesicles, and bullae (blisters).
In some cases, the best treatment is to do nothing to the area.
Topical corticosteroid medications may reduce inflammation. Carefully adhere to instructions when using topical steroids because overuse of these medications, even low-strength over-the-counter topical steroids, may cause a troublesome skin condition.
ref:http://www.myonlinewellness.com/topic/adam1000869