Keratosis Follicularis Spinulosa Decalvans (KFSD)

Keratosis Follicularis Spinulosa Decalvans (KFSD) has been associated with mutations in the MBTPS2 gene.

KFSD is a disorder affecting the skin and eyes. In affected men, the skin findings include inflammatory hyperkeratotic follicular papules or pustules on the scalp, eyebrows and elsewhere on the integument. This process leads to progressive scaring alopecia. Eye findings include photophobia and corneal dystrophy. Other findings include hyperkeratosis of the elbows, knees, and palms and soles. KFSD can be distinguished from IFAP due to the nature of alopecia, which is progressive and scaring in KFSD, and congenital and non-scarring in IFAP. Carrier females are usually less severely affected.

Tests Available

Forms and Documents

Test Details

  • Confirmation of a clinical diagnosis
  • Carrier testing for at-risk family members
  • Prenatal diagnosis for known familial mutations


4 weeks
2-5 mL Blood - Lavender Top Tube
Buccal Swabs

*Reporting times are typical, but could be extended in situations outside GeneDx's reasonable control.


  • 757.1 Ichthyosis congenita, Congenital ichthyosis, Harlequin fetus, Ichthyosiform erythroderma
  • 757.39 Other Accessory skin tags, congenital, Congenital scar, Epidermolysis bullosa, Keratoderma (congenital)
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**The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.


  1. Oeffner et al., (2009). Am J Hum Genet 84: 459-467.
  2. Naiki et al., (2011). Am J Med Genet Part A 158A: 97-102.
  3. Aten et al., (2010). Hum Mutat 31(10): 1125-1133.