It might be a cheloid (keloid). This is scar tissue that is thick and sometimes a different color from the rest of the skin.
Cheloids form when normal healing is interrupted like Alan's continuous ulcer.
So don't get upset yet. And remember Alan has psoriasis and healing with that is sometimes different for them.
http://www.hmc.psu.edu/healthinfo/jkl/keloid.htm
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Weezie looking at petunias 8.25.2017
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