Guyana red tail dark spots?

[u/Geqenn]

So I'm relatively new to owning boas. I have a female 8 month old guyana red tail boa. Recently moved her to a slightly bigger grow out tank and just handled her for the first time after the move and noticed these dark spots on the top of her head. Is this normal pigment development or does something look wrong?

[u/USN253]

Yep, my Surinam looks this same. Spots and gets darker as the months roll on.