Differentiating Fordyce Spots from Their Common Simulators Using Ultraviolet-Induced Fluorescence...

Area of Science:

• Dermatology
• Medical Imaging

Background:

• Fordyce spots (FS) are common heterotopic sebaceous glands.
• FS are frequently misdiagnosed as sexually transmitted infections, particularly in genital areas.
• Accurate differentiation from clinical simulants is crucial for appropriate patient management.

Purpose of the Study:

• To evaluate ultraviolet-induced fluorescence dermatoscopy (UVFD) for identifying characteristic clues of Fordyce spots.
• To compare UVFD findings of FS with common genital conditions like molluscum contagiosum, penile pearly papules, warts, lichen planus, and porokeratosis.

Main Methods:

• Retrospective single-center study analyzing patient records and photodocumentation.
• Inclusion of clinical, polarized, non-polarized, and UVFD images.
• Comparison of UVFD patterns between 12 FS patients and 14 control patients with differential diagnoses.

Main Results:

• A novel UVFD pattern for Fordyce spots was identified: regularly distributed bright dots over yellowish-greenish clods.
• This UVFD pattern demonstrated potential specificity for FS.
• UVFD was found to be a fast, easy, and low-cost diagnostic adjunct.

Conclusions:

• UVFD offers a valuable tool for increasing diagnostic confidence in Fordyce spots.
• This technique can help differentiate FS from various infectious and non-infectious genital conditions.
• UVFD complements conventional dermatoscopy for improved diagnostic accuracy of Fordyce spots.