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Good morning, I am Dr Ruff, thank you for contacting us today
I am very sorry to hear this. If the breast is hot and tender, my concern would be a secondary infection which can also trigger the psoriasis.
As you know the psoriasis flare up will often settle on its own, but it sounds like you should get someone to examine you to check for infection.
If the psoriasis continues to be an issue, have you tried light therapy for this? It has good results when widespread, just harder to come by as you would need particular dermatology departments to provide it.
Okay thanks. Hidradenitis itself could cause aggravation, more due to irritation to the skin from sweating, therefore a fungal cause is a potential, but hot and warm areas may be more suggestive of a cellulitis.