What Causes Armpit Discoloration With Bruising And A Jaw Lump?

Um, yeah, so a while ago, perhaps a month or two, I developed some sort of discoloration on my right armpit. (it looks sort of like a brownish bruise) But recently, it's starting to get darker. I'm sort of afraid that it might have something to do with the fibristic adanoma (?) that I had removed in December, and that it was actually cancerous? Plus, I'm wondering if it would have anything to do with a lump I found on my jaw. =\ To be honest, I'm afraid that it's something to do with my lymph nodes... (( Sorry, I'm really bad at coming up with a focused question))