Is Quinquaud Folliculitis Decalvans Contagious to Others?

No, Quinquaud folliculitis decalvans (FD) is not considered a contagious disease, and you cannot “give” the condition to your family or friends ^[1].

While the presence of pustules (pus-filled bumps) on the scalp can look like a transmissible infection, FD is actually a rare, chronic inflammatory condition around the scalp hair follicles that leads to permanent scarring hair loss ^[2]. You do not need to isolate yourself from your loved ones. Understanding why FD happens—and why it isn’t contagious—requires looking closely at the difference between having bacteria on the skin and actually having a transmissible disease.

What Staphylococcus aureus May—and May Not—Mean

Many patients with FD have a bacterium called Staphylococcus aureus (S. aureus) on their scalp and inside their pustules ^[3]. S. aureus can cause common skin infections, including infections caused by MRSA strains. Because of this, it is entirely normal to worry about spreading it.

However, the exact cause of FD is not fully understood. While S. aureus and other microbes may trigger or contribute to inflammation in some people, finding the bacterium does not prove that it caused FD or that FD can be transmitted ^[3].

S. aureus frequently colonizes the skin, meaning it lives there without causing a standard infection. In FD, the bacterium is often found not just in the pustules, but also on normal, unaffected areas of the scalp ^[3]. Research suggests that FD involves a complex interaction where the immune system may respond abnormally to the ordinary bacteria living in the hair follicles, rather than being a straightforward infection ^[4].

While you cannot transmit FD to someone else, drainage from open sores can contain bacteria. If someone else comes into contact with this drainage, they will not “catch” FD, but they could potentially acquire S. aureus or develop a separate, standard staph infection (especially if they have broken skin or are medically vulnerable).

It Is Not Caused by Poor Hygiene

A common and damaging myth about FD is that it is caused by being unhygienic. The medical evidence is clear: poor scalp hygiene is not a cause or risk factor for folliculitis decalvans ^[1]. The presence of S. aureus should not be mistaken for a lack of cleanliness ^[3].

While family members sometimes also develop FD, this is not because they caught it from each other. Rare reports of more than one affected relative have led researchers to consider a possible genetic predisposition, but this is not established ^{[5] [6]}. Household clustering does not prove either inheritance or transmission.

Practical and Sensible Precautions

Even though FD is not contagious, the presence of bacteria and open sores during a “flare” means that basic, common-sense hygiene steps are a good idea. These optional measures help reduce the transfer of drainage or ordinary skin bacteria:

• Practice ordinary hygiene: Regular handwashing and standard laundering of clothes and bedding are sufficient. Wash your hands after touching your scalp or applying topical treatments.
• Avoid sharing items during flares: If you have actively draining pustules, avoid sharing items that contact the drainage, such as hats, helmets, pillows, towels, combs, hairbrushes, or hair clippers. You are not doing this to prevent someone from catching FD; you are simply preventing the transfer of drainage.
• Skip extreme measures: Household members do not need testing or special cleaning simply because you have FD. “Decolonizing” everyone in the household (using prescribed antiseptic washes and nasal ointments for all family members to eliminate staph) is not routine FD treatment and should only be considered if a clinician specifically recommends it for recurrent bacterial issues ^[7].

The most important focus in managing FD should be working with your dermatologist to control the inflammation and prevent irreversible hair loss ^[7].

When to Seek Immediate Care:
While FD flares naturally cause pustules and crusting, you should seek prompt medical advice if you experience rapidly spreading redness or warmth, increasing swelling or pain, fever, or foul-smelling drainage. These can be warning signs of a secondary bacterial infection that may require a culture (a lab test of the drainage) and specific antibiotic treatment.