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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.