Pityriasis Rosea Differential Diagnosis

Pityriasis rosea is a common skin rash characterized by a gradual spreading that extends out from a single originating spot on the body. Doctors may use several different methods to distinguish (differentially diagnose) this condition from other skin ailments.

Physical Examination

Cases of pityriasis rosea may last anywhere from three to 12 weeks, according to the U.S. National Library of Medicine. Initial diagnosis typically involves a physical examination of the rash.

Early-Stage Diagnosis

In cases where a pityriasis rash is well-developed, a physical exam may provide sufficient information for a diagnosis. However, early stages of the rash may closely resemble a number of different conditions, notes the Mayo Clinic.

Similar Ailments

The Mayo Clinic cites skin conditions with appearances similar to early-stage pityriasis rosea that include eczema, psoriasis, ringworm and secondary syphilis.

Testing Methods

Methods used to differentiate cases of pityriasis rosea that include blood tests and skin biopsy (tissue sampling), according to the U.S. National Library of Medicine.

Considerations

Once they resolve, cases of pityriasis rosea do not typically return, notes the U.S. National Library of Medicine.

References

• Medline Plus - U.S. National Library of Medicine: Pityriasis Rosea
• The Mayo Clinic: Pityriasis Rosea