It is lipstick.
...wait a minute! How do you know it's lipstick? Did someone tell you that it was?!
...When I describe Reed (in fanfic), I most often use the phrase 'lean and compact'. There's a great shot of him from "The Andorian Incident", when the secret Vulcan listening post is discovered below the temple, that shows the viewer just how tightly the wardrobe dept fitted those jumpsuit uniforms... I just can't find it in my folder of photos... I mean, seriously, look at his bicep (see above), and then look at his wrist (see above)...
...ooh... fluffy hair... fluffy, fluffy, fluffy!