I had never heard of this before, but it does exist. The only good thing that can be said about it, is that it is not so noticeable than the facial type of acne!

I found several websites that have good information on how to treat this nasty sounding problem, this is a quote from one of them;

"Scalp acne

Acne can occur on the scalp much like it can on the face and on the rest of the body. However, the scalp can be harder to treat topically because the hair gets in the way. The good news is that scalp acne is often much less noticeable because the hair covers its appearance. Many people get occasional pimples on the scalp and simply let them be. I myself have experienced pimples from time to time on my scalp and I simply ignore them. While lesions on the scalp can tend to be tender and sore, they usually clear on their own within a week or so.

What to avoid: Avoiding oily products is a good preventative measure against scalp acne. Styling products sometimes contain oils that can aggravate acne. Styling products can also contain other irritating ingredients. If you’re battling with some scalp acne, try forgoing your usual styling products for a week or two and see if that helps clear you up. Some hair conditioners also contain heavy humectants which can irritate acne-prone skin. Again, if you’re struggling with scalp acne, try using only a gentle shampoo for your hair and not using conditioner for a week or two and see if that helps.

Treatment options: You can treat acne on the scalp with many of the medications used to treat acne on the rest of the face and body. One exception is benzoyl peroxide, which tends to bleach hair in some people. This outcome is sometimes desired and sometimes not. Unfortunately, I have found that proper use of benzoyl peroxide is the best way to get rid of acne. Other medications like salicylic acid can easily be applied to the scalp with the fingers or with a cotton ball, but unfortunately do not tend to work very well. People on the acne.org messageboards have also been experimenting with dandruff shampoo to treat their body acne, so shampooing with a dandruff shampoo may be a good option for the scalp as well. Ingredients in dandruff shampoo such as zinc have been shown to be beneficial to acne prone skin, and antifungal ingredients in dandruff shampoo like ketoconazole or ciclopirox may be able to help with scalp folliculitis."

I hope this and the video helps your friend.

Yes there is such thing as scalp acne and it is the mildest form and is also known as scalp folliculitis. This occurs more frequently than most people realize. Acne that are found in the scalp are usually triggered by great stress. This also happens when the scalp becomes oilier than usual.
Scalp acne can be very itchy and make is difficult not to touch it. The pustules are small, crusty and sore and appear mainly on the upper forehead at the hairline. A person can have just a few pustules or many.
There is a severe form of scalp acne called ace necrotica miliaris. This has a large papules that are inflamed with black-colored crusts. This kind of acne can leave scars that resembles that of Chicken Pox.

Mild forms can by treated just the way an acne is treated by keeping the affected area clean and using a product that contains salicylic acid. Using shampoo that is formulated for oily hair should also be encouraged. Some products that are made for treatment of seborrhea have been used for scalp acne effectively.
And one thing to avoid is using any product that contains bezoyl peroxide for this can aggravate the acne on the scalp.

Scalp acne is actually a condition. It can be caused by the same factors of regular acne. I actually went through a spell of having it on my head, and it would act up most often right before my menstrual cycle each month.

Scalp acne can occur on the actual scalp or on the hairline. There are two different types of it. Acne Necrotica Miliaris is the more severe type of acne in this location. Scalp Folliculitis is milder.

It is said that high stress and hair that is oily can be a perfect breeding ground for this type of acne. People with oily hair and scalp should shampoo regularly and avoid the use of oily products on the hair.

There are special shampoos made for scalp acne that have benzoyl peroxide in them. It much be used in moderation and carefully because the peroxide discolors the hair. Your friend can use cortisone cream or coal tar based shampoos to help with the itching.