My neighbor's skin is getting fragile. The wound heals for a long time and always leaves a scar. What to do?

My neighbor's skin is getting fragile. The wound heals for a long time and always leaves a scar. What to do?

When he even scratches the place bitten by a mosquito a little, blood appears in this place. Earlier it was also, but not so much. I study at the medical school, and therefore he asked me for advice. He refuses to go to the doctor.

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