If you have dry skin or dry scalp then always you have to take care for not getting severe dryness. How you understand that you have severe dry scalp? Check is there any formation of flaky scalp. Flakes are due to dead cells coming out in large quantity. The outer layer of cells in the skin is becoming dead and it causes flaky cells. Normally when you find this condition certainly you will go for hot oil head massage. Yes it is good. But before jumping into that remedy, just give few minutes to think. If there is lot of flaky cells on the scalp and this condition prevailed long before then oiling is not recommended. Why? Along with dead cells there will be dirt accumulated. When you apply oil that may create a very damp scalp which can produce bacterial infection on the scalp. This leads to dandruff. But if there is very little flakes and it started very recently then oiling can help.
Sometimes this dead cells on the scalp can be interpreted or suspected as dandruff. Then what you do? You use dandruff shampoo. This may cause excess dryness. So do not get confused with dryness and dandruff.
When the flakes are dropped on the forehead it causes to produce small pimple like bumps on the forehead. There is no need to go for a pimple treatment. Take care of the flakes then the pimples will run away.
Instead of using oil on the scalp just use oil (very lightly) on hair only, avoiding two inches from the scalp side. Continue this for few days. At the same time take bath or head washing without using shampoo. And towel dry scalp very lightly. Do not scratch on the scalp but gently rub with fingers. This will drop out the flakes gradually. After a week or two you can see the flakes are diminishing. The oiling on the hair keep the scalp not getting more dryness. After removing the fakes you can oil the scalp also. After this you have to take care doing oiling once in a week.
If you do not use oil then try suitable hair packs.(search in this site for "hair packs") Wash hair thoroughly in water and do rub with fingers then wash again. Do not use hard shampoo. Towel dry hair and use hair pack. This will definitely solve the problem.
The mail which I received tells that she has sinus problem, so she cannot use oil or hair packs. What is a solution in this situation. Simple, your aim should be to remove the flakes first. Wash hair in water without using hard shampoo. Use green gram powder to wash the scalp if you want. Rub on the scalp with fingers while doing washing. Then towel try hair and scalp. After few days of removing the flakes use mild herbal hair conditioner. This will keep hair moisturized and this will help the scalp to become normal.
So please read the above post three times and choose a suitable remedy. Good luck.