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The mark (redness) left after you cum and wipe it off.
I jizzed on your mum's face last night and left her with a cum rash.
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A rash like irritation that can form on a man's inner leg regions. This irritation formulates due to the man ejaculating semen and allowing it to pool in their inner thigh region, thereby causing irritation as they walk around due to the moist environment and friction.
The irritation or "Cum Rash" clears away after a shower to remove bacteria and adequate drying of the area.
This should not be confused for Semen Allergies.
Argh! It hurts to walk a little, this Cum Rash burns!