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This is Dr. D.J., experienced Internal Medicine Specialist.
I am here to address your concerns and provide great service.
redness alone is not concerning if you do not have any pain or warmth around the healed ulcer area.
The redness will gradually fade away over 6 to 12 weeks.
This is due to the formation of the healthy granulation tissue which will gradually be replaced by the normal skin.
You can try Tretinoin cream 0.025% daily over the area which will help with the faster recovery.
Tretinoin is vitamin A derivative and helps with redness and skin growth.