No other angiomas show this phenomenon. The underlying cause for the development of cherry angiomas is not understood. Littoral cell angiomas show in CT scans. Multiple adjoining angiomas form a "polypoid angioma". Spider angiomas can recur after treatment. Dermatological effects include cherry angiomas, acneiform, pustular and erythematous rashes. If the spider angiomas are associated with pregnancy, they may resolve after childbirth. Spider angiomas are asymptomatic and usually resolve spontaneously. Tufted angiomas are associated with arteriovenous malformations. In most patients, the number and size of cherry angiomas increases with advancing age. Tufted angiomas are usually poorly defined lesions of purple colouration. About 33% of patients with cirrhosis have spider angiomas. Cherry angiomas occur in all races, ethnic backgrounds, and sexes. Spider angiomas form due to failure of the sphincteric muscle surrounding a cutaneous arteriole.