What's your hair regimen? Is your hair relaxed or natural? Are the scabs a result of chemical burns or just dryness?
My suggestion is to keep your scalp clean by washing frequently. You don't have to use shampoo with every wash, you can use conditioner or a gently sulfate-free shampoo. I used to have a dry, flaky scalp and I've found that 3 things help: 1. cleansing my scalp regularly (1-3 times a week), 2. Pre-pooing when my scalp is especially itchy, and 3. Avoiding the use of heavy petroleum products like "hair grease" on my scalp.
If I must put something on my scalp, I use a natural oil. I used to pre-poo with conditioner mixed with rosemary, eucalyptus, and peppermint oils. One non-natural commercial oil mix that I sometimes pre-poo with is Dr. Miracle's Stimulating Growth Oil. I put it on my scalp with a plastic cap before shampooing and it helps to keep the itchiness away. (Note: the ingredients in Dr. Miracle's are not that good, so I always shampoo it out. I just love the tingling sensation of those products & salicylic acid is good for my scalp and skin).
Lastly, when you wash your hair, let the water flow directly onto your scalp for a few minutes. When you condition your hair, massage the conditioner into your scalp and not just your hair (be sure to rinse thoroughly). That can help keep it from becoming dry.
ETA: Trust me, I had dry flaky scalp for years and I found that the number one culprit for me was not keeping my scalp clean. If the problem persists, it may be a more serious condition ...so if you can see a doc to rule out any skin conditions that would be a good idea.