Pyogenic granuloma is a skin lesion also called granuloma telangiectaticum.

CNN: What causes pyogenic granuloma?

When did you first notice this skin growth or lesion?

CNN: Basal cell carcinoma

The lesion on the skin starts out as an itchy pimple, which eventually becomes like a blister.

CNN: "The Secret Life of Germs" author Philip Tierno

This requires that the skin's integrity be breached, in other words, there has to be a cut, a scratch or a lesion on the skin for these spores to germinate.

CNN: "The Secret Life of Germs" author Philip Tierno