Face??? Forehead??
I use my thighs a lot since there’s a lot of great surface area, and I like the absorption. However, there are some blood vessels towards the inside (medial part) of the thigh. It depends on how much fat cushioning a person has and the size of their muscles, but I would probably avoid the more medial part of the thigh because of those blood vessels and nerves (see below)
You should be careful here since there is a neurovascular bundle that could be damaged from injecting if you end up in the femoral triangle since there isn’t so much of protection with muscles. Hopefully the image is helpful there.
Is this ranking for subQ and/or IM??
For me, SubQ - Calves, thighs, breast, biceps, shoulder I get great absorption. Stomach and triceps aren’t great for me. I haven’t really tried back, butt, or hamstrings so that will be fun to try out