Typical features of the condition include blackheads or whiteheads, pimples, oily skin, and possible scarring. Squeezing blackheads and whiteheads can remove them, but it can also damage the skin. Comedones (blackheads and whiteheads) must be present to diagnose acne. Some dogs are prone to have acne or at least blackheads. Oxidation rather than poor hygiene or dirt causes blackheads to be black. Soon we shall marry and live in filthy compatibility, feasting on each other's blackheads. Another example is The House of the Blackheads, completely destroyed, its ruins were subsequently demolished. Nowadays the House of the Blackheads is a fascinating museum. In 1895, the Brotherhood of Blackheads in Tallinn was formally reconstituted into the Blackheads Club. Their first performance took place at the House of the Blackheads in Tallinn in 1994. In the 17th century, a brotherhood of Blackheads was also established in Wismar, Germany.