Scalp scabs can be caused by several conditions. Some may clear up on their own, and some might require treatment. These include contact dermatitis, psoriasis, eczema, and dandruff. Use extra caution when styling your hair when you have a scab on the scalp. Brushing or combing your hair near the scalp scab can rip it and disrupt healing. As the scab starts to heal, you may forget it is there. It may help to post a reminder on your mirror where you style your hair.