A series of fights between Lindsay Lohan and girlfriend Samantha Ronson have the couple’s friends concerned that the stress could be leading the once popular actress to self-harm after they recently spotted mysterious scratch marks all over her arm.

“The marks looked really red and sore,” a pal revealed to Britain’s Daily Mirror on Monday.

“She tried to hide them under a long-sleeved shirt but when she lifted up her arm to show someone a picture on her mobile phone you could see the lines on her arm.”