If you can hide out for a day to let it heal, do so.

Put some antibacterial ointment like neosporin on it (or I personally like a colloidal silver wound ointment) and place a small circle bandaid over it to prevent bumping it and to help keep bacteria out.
If you must go out, then a liquid banadage has worked for me. After it dries, I gently apply a little concealer. Be very careful when / if you wash off the liquid bandage later so you don't reopen the wound.

Acne spot patches are also very useful to have on hand. Unfortunately they often have to be ordered online. I like ones by a Korean brand CosRX called acne pimple master patch which be found online, but Nexcare also makes some sold online at Walgreens (not sure where you're located).

Hope that helps! Unfortunately I've been in this situation too many times myself, so I understand what it's like.

You can often keep those from leaking with a styptic pencil.