I am not a doctor but a few things I thought of is migraine headaches and high blood pressure. These can cause pain at the back of the head. If neither applies I would certainly ask my primary care physician to see a Neurologist or, at least, an opthomologist to see if he/she can determine if there is something that can be detected in the eye. A neurologist might suggest an MRI to see if there are any tumors or aneurysm. That is extreme but I certainly wouldn't ignore these painful bumps.
There are many reasons why you might have painful bumps on left side of scalp. These could be bug bites.
because the blood is going to that area to heal it and creats a bruise
Usually within 24 hours a bruise appears--IF it will bruise. Not all bumps cause bruises. Between 2 to 4 days, the bruise will be at full dark colors before it begins to lighten.
no
They are swellings of the tissues that you injured. Sometimes, they bleed and you will have bruise.
Ingrown Hair
Depending on the reason for these bumps, they are your body's defense to other 'hits' . They hurt because they were probably bruised.
acid bumps in the mouth - extremely painful
It causes hard, painful bumps under the skin that are deposits of calcium
The lining of the eyelids and the surface of the white of the eye becomes red and severely painful, with multiple small yellow bumps and pitted sores (ulcers). Lymph nodes around the ears, under the jaw, or in the neck may swell and become painful.
could be genital warts caused by HPV
Signs of herpes are itching, burning, or painful bumps that occur anywhere on the skin. If these bumps occur, see your health care provider promptly for accurate diagnosis.