I'm curious - what do you mean by 'dirty head'?
Because what I think you mean, might not be what you are talking about.
Some things to understand about boas (in case you didn't already know) -
Boas can go through a light and dark phase. Hypos and smaller locality boas (esp hog isles) tend to show this the most. Can be depending on the temps, depending on the time of day (usually darker at night and during cooler temps). Their entire coloration can deepen, dark spots appear darker and color can appear muddied; in the light phase, everything lightens up, blacks and greys can turn super light and that also allows more of the pinks to show up.
Boas are usually born with a grey wash, some of us call it the 'baby greys'. It's especially noticeable on the laterals. As boas age they develop the yellow pigment. Reds/oranges/pinks may or may not fade as the boa gets bigger. So you'll see the greys fade off and the background coloration turn a tan, buckskin or brown color, this is the yellow coming in. This is also why albinos are red/orange and whiteish as babies and turn into large yellow bananas. The reds are fading and the yellows get brighter.
Some boas, especially the harlequin line, brighten up coloration and get really pink 24-48 hours into digestion. Just a neat thing I've noticed.
I hope that helps?
I have some hypo harlis and jungles I've raised up but I don't have any good recent photos to compare to their younger pics. I guess I should get updated pics of everyone one of these days.
Here's a normal baby from my first litter ever and then a photo the owner sent me about 4 years later.
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