recently I got into a slow speed crash that ended up with me scuffing into a wall and the pavement. Initially I didn't feel any head-crash but after finishing my ride I noticed that my helmet was scuffed as well as a fine line on the same side of my head where I think the helmet pushed into my skin (just a mark no wound).
I read that light scuff marks without impact shouldn't matter, but since I have that mark I imagine there was "some" impact to it.
Hence I'm wondering should I be replacing this helmet? (my gutt says yes, since I only have one head)