A rushed put somebody through the mill more or less Hydrocodone (M367)?

Why does my boyfriend get redness under his eyes when he take Hydrocodone (M367)? He's on it right now for his back pain.. His facade turns pale and he gets what looks like sunburn underneath his eyes? He says it feels like sunburn too. He will also perceive sick for a while and stay high for long periods of time, even if he only take one... is this an allergic reaction? should he stop taking this? what do you think it could be? I swear it looks like he have sunburn under the eyes....
Answers:
It doesn't sound like an allergic allergic reaction but it is definitely not normal. Has he tried breaking it in partially. It is 10mg which may be too much. I would stop taking it and contact his doctor immediately. There are other pain medications he may tolerate better. Nausea is a adjectives side effect of hydrocodone, but the burning sensation is not.

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