Diagnosis: Guttate psoriasis:  A 41-year-old male patient received BNT162b2 (BNT162B2), as dose 2, single (Batch/Lot number: unknown) for covid-19 immunisation. The patient's concomitant medications were not reported. A 41-year-old man presented for evaluation of an extensive skin rash that had erupted more than a month earlier. The patient had received 2 doses of the Pfizer COVID-19 vaccine 3 weeks apart. Ten days after his second dose, the patient developed a rash all over his body. He described the rash as burning, itchy, and uncomfortable. The patient denied any triggers such as recent or previous infections, stressors, or drugs. The patient had no personal or family history of dermatologic disorders; his general medical history was unremarkable. The patient smoked and drank alcohol occasionally. On physical exam, the patient had a diffuse rash, which initially had manifested on both of his hands, including the palms, and then spread to 60% to 70% of his total body surface area, including his face, ears, anterior and posterior chest, upper and lower extremities, and buttocks. The rash consisted of 10- to 15-mm white scaly plaques that did not bleed. Diagnosis: Guttate psoriasis: Punch biopsies were obtained, and histopathology revealed diffuse compact hyperkeratosis with broad zones of parakeratosis. There was attenuation of the granular layer and regular elongation of the rete ridges associated with thinning of the suprapapillary epidermis and mild spongiosis. These pathologic findings were consistent with a diagnosis of psoriasis. There were no drug-related skin eruption features, such as apoptotic keratinocytes, eosinophils, or interface dermatitis. Periodic acid-Schiff stains for fungal organisms were negative. The combined clinical presentation (itchy, teardrop-shaped, scaly lesions) and histologic impression were consistent with guttate psoriasis. Triggers for psoriasis: Vaccinations, medications, and infections (eg, group A beta-hemolytic streptococcal upper respiratory infections) can trigger guttate psoriasis. MRNA vaccines (eg, Moderna and Pfizer/BioNTech COVID-19 vaccines) have been associated with psoriasis episode. The impact of COVID-19 vaccine: We are still learning about the incidence and prevalence of adverse effects (such as psoriasis) that can follow COVID-19 vaccination. One study found that the average time of new onset of psoriasis or flare-up can be between 5 to 14 days after COVID-19 vaccination. Psoriasis following vaccination: The pathologic mechanism for the new onset or flare of psoriasis after COVID-19 vaccination is unknown. What is known is that the dysregulation of Th-1 and Th-17 plays an important role in the pathogenesis of psoriasis. Previously, it was found that psoriasis can manifest after tetanus-diphtheria vaccines due to an increase in the production of Th-17 cells.7 Th-1 and Th-17 production also increases after influenza vaccine and can cause an onset or flare-up of psoriasis. How to make the diagnosis: Psoriasis can be diagnosed by physical examination. A skin biopsy is not usually necessary but can be helpful for complex cases. There are no laboratory or genetic tests to confirm the diagnosis of psoriasis. Depending on the case, routine bloodwork (eg, complete blood count and metabolic panel) and infectious disease tests (eg, HIV, hepatitis panel, and rapid plasma reagin for syphilis) can be helpful to rule out other etiologies of skin rash. Treatment is based on patient factors and disease severity: In this case, betamethasone dipropionate 0.05% cream twice daily for 2 weeks was not sufficiently effective due to the extent of the psoriasis. Following consultation with a dermatologist, clobetasol propionate 0.05% cream twice per day and oral apremilast (10 mg once per day on the first day and 10 mg twice per day afterward) were prescribed for 2 weeks. The patient's psoriasis improved somewhat after 2 weeks of the treatment, but many plaques remained. Therefore, apremilast was stopped and subcutaneous adalimumab was started (initial loading dose, 80 mg, then 40 mg every other week). The psoriasis lesions cleared over the next 2 to 3 months. The patient was maintained on the adalimumab to avoid a recurrence of lesions. The outcome of event was recovered. Therapeutic measures were taken as a result of psoriasis.  No follow-up attempts are possible; information about lot/batch number cannot be obtained. No further information is expected.; Sender's Comments: Based on the given information , the possible contributory role of the suspect for the event guttate psoriasis cannot be completely excluded. The impact of this report on the benefit-risk profile of the Pfizer product and on the conduct of the study is evaluated as part of Pfizer procedures for safety evaluation, including the review and analysis of aggregate data for adverse events. Any safety concern identified as part of this review, as well as any appropriate action in response, will be promptly notified to regulatory authorities, Ethics Committees, and Investigators, as appropriate.