What role does environmental factors such as stress and trauma play in psoriasis etiology?

Explanation: Plaque psoriasis is the most common type of psoriasis, accounting for approximately 80-90% of all cases. It is characterized by the presence of raised, well-defined, erythematous (red) plaques with silvery-white scales.

Incorrect choices: a. Guttate psoriasis: Guttate psoriasis is characterized by small, teardrop-shaped lesions scattered on the skin, often following a streptococcal infection. It is less common than plaque psoriasis.

b. Inverse psoriasis: Inverse psoriasis affects skin folds, such as the armpits, groin, and under the breasts. It appears as smooth, red patches and is less common than plaque psoriasis.

d. Pustular psoriasis: Pustular psoriasis is a specific subtype characterized by pustules on the skin, but it is less common than plaque psoriasis.

Explanation: Environmental factors such as stress, trauma, infections, and certain medications are considered triggers that can worsen psoriasis symptoms in individuals who are already genetically predisposed to the condition. These triggers can lead to psoriasis flare-ups or worsen existing plaques.

Incorrect choices: a. Primary cause of psoriasis: Environmental factors are not the primary cause of psoriasis. While they can influence the severity of symptoms, the condition itself is primarily driven by genetic factors and immune system dysfunction.

b. Minor role with no significant impact: Environmental triggers are not minor in psoriasis etiology. They can have a significant impact on symptom severity and recurrence in susceptible individuals.

d. Protective factors against developing psoriasis: Environmental factors are not protective against developing psoriasis. As an autoimmune condition, psoriasis is primarily influenced by genetic predisposition and immune system dysfunction, not by protective environmental factors.