Black stuff? Ideas

Hi
I just need an opinion because this is driving me to drink - and yes I'm letting my vet know but not open until Monday.
This morning Crue had dark brown/black on her underneath & side of her head. Was not there yesterday or at bedtime.
So I discovered my bf's son had popped the feed door to "mist the moss".
*facepalm*
Not only denting the bar but the tape I had just temporarily put there was popped as well (I had to find the screen repair tape, as the kitten & one other cat believe the heat lamps are theirs as well).
Now the tape has never been an issue (?) Til possibly now - I attempted a feed on the 5th but refused; as at the time we didn't know eggs were about to happen!
(Refused, shed, then 3 slugs as of 2 days ago). She's her normal active, happy self. All over & in my hoodies & hair... So no personality change.
If anyone could help with ideas it would help my sanity.
I've tried cleaning with both warm water on a washcloth and a saline cloth. Nothing.
Pics included.

Ummmm...... Other details:
Tank is 40 gal breeder (never been bred)
Orchid bark bedding
Sphagnum moss under the log, out in front & in a small bowl for humidity (per vet)
Water bowl
Bowl for soaking /apparently laying eggs under
Cool side: 70° humidity 40%
Warm : 81° humidity 40%
Hot: 86° humidity 43%
I just misted as a note - normal without mist is 30% on cool & warm; between 25 -30% on the hot
I have a 150 watt bask lamp there; cool side I have a 60w daytime heat; for night I use a 50w night heat dead center of tank.
Vet suggested the higher temperatures on hot side....
Going off of someone else's info for a while I thought Crue was a boy. (He was adopted March 2019) Surprise!!
Thanks everyone!

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So is the black stuff adhesive from the tape? If so then maybe try rubbing alcohol on a cotton ball. Worst case is it comes off with the next shed.

67temp said:

So is the black stuff adhesive from the tape? If so then maybe try rubbing alcohol on a cotton ball. Worst case is it comes off with the next shed.

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I'm not sure; I checked the tape & all was secure but one spot by the latch - not enough to do something like this. Was the size of my pinkie nail.
In case I'll try your suggestion of the rubbing alcohol & cotton ball & keep informed - Thank you!

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If it is not bothering the snake, and isn't itself causing any problems, might be best to just leave it be. Be aware that some solvents (like alcohol) can be toxic if used incorrectly.

Rich Z said:

If it is not bothering the snake, and isn't itself causing any problems, might be best to just leave it be. Be aware that some solvents (like alcohol) can be toxic if used incorrectly.

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It definitely isn't bothering her at all - just scared me on the " this wasn't here last night; how the...." Factor.

Noted on alcohol - I'll pass on it then.

The top is fixed properly with the screen stuff; I'm looking forward to avoid more questionable mornings in the future.

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As was suggested by 67temp, just wait it out and see what happens after the next shed. More than likely it will all come off along with the old skin.