It's quite possibly a sebaceous cyst that burst. They often form from an ingrown hair. Basu used to get those a lot. It looks like it's scabbed over now but just to be safe you could use a warm, wet washcloth to be sure it's clean and pus-free and then put some calendula cream on it (or whatever first aid stuff you've got). Then watch the area just to be sure it heals up.
Ruth & the 4 Legged Rescue Gang
Rafi the malaroo
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Gio & Varda, the krazy kittens
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