Brits travelling to Spanish hotspots could face a "plague" of insects that feed on human blood.
The blood-sucking bed bugs have been found in popular tourist resorts and hotels, sparking a warning from authorities.
The insects have appeared in Majorca, Alicante and the Canary islands leading to concerns in some sunshine hotspots.
Express.co.uk reported the National Association of Environmental Health Companies (ANECPLA) issued the warning after the bugs were discovered in sunshine hotspots.
Jorge Galván, general director of ANECPLA, said: "We are concerned about the impact of the reactivation of tourism on a plague closely associated with the hotel sector and tourist homes: the bed bug.
"This parasitic insect between five millimetres and six millimetres in length usually nests in beds, the folds of sheets, furniture or armchairs and feeds mainly on human blood.
"Its bite causes discomfort and even various allergic reactions, insomnia or stress.
"Due to their tiny size, they often stow away between clothes or suitcases, causing new infestations in homes, hotels or apartments."
Travellers have been warned to check for the blood-sucking bugs in their hotels - even if they think rooms would be clear.
And experts from Rentokil said sunscreen and flip-flops may be the top of travellers' packing lists, but they should consider more unwanted side effects of bed bugs.
Bed bugs, people think, are only drawn to unclean places. But pest control experts said such "misconceptions" could put people at risk.
The Mirror reported in June how holidaymakers travelling to Spain were warned of a "critical" increase in mosquitoes, cockroaches, ticks, wasps and bedbugs this summer.
Torrential rain followed by the recent heatwave created "an unbeatable breeding ground for the pests ", according to Anecpla.
The environmental association said that many local authorities have also stopped prevention campaigns due to costs and labour amid the pandemic.
Jorge Galvan then explained: "This summer is expected to be worse than usual.
"The exorbitant temperatures of the last few days and those to come, added to the torrential rains of spring, constitute the perfect storm for the populations of mosquitoes, cockroaches, ticks, wasps, bedbugs to grow at lightning speed.
"And it is that to the climatic conditions is added that with the pandemic they have stopped carrying out many treatments against pests of prevention and maintenance."
He also said the pandemic had impacted maintenance and environmental checks when most people would think they have increased health measures.
He added: "Since the beginning of the pandemic, we have detected that many councils have neglected the items related to pest prevention tasks at a crucial moment when what is necessary is just the opposite."#
